Owner: planar is cheap enough (~1 ms CPU, GPU about even) to replace SSR outright. High water
always reflects with the planar mirror; the waterReflections cvar, its preset rows, the options
row (EN/RU) and the debug knob are removed. The screen-space march stays only as the mirror's
fallback for water at another height than the mirror plane; WOW_WATER_REFLECT=0 remains a dev
A/B switch.